盐城市某原水预处理厂设计与运行分析
井添祺,周家中,时丹,李凤达,周宸宇,王忠祥,吴迪
(青岛思普润水处理股份有限公司 山东青岛 266510)
摘 要 江苏省盐城市某原水预处理厂总处理规模为30万m3/d,要求出水达到《地表水环境质量标准》(GB 3838—2002)Ⅲ类水体要求。综合进出水水质、投资占地等,经充分经济论证和方案比选,采用“高锰酸钾预氧化+MBBR生化法+中置式高密度沉淀池”组合工艺对原水进行强化处理。核心生化段采用纯膜MBBR工艺,设6级硝化,气水比设计为0.6~1.3。实际运行结果表明,各出水水质稳定达到地表水III类标准,其中,氨氮最低可达0.1mg/L。对悬浮载体进行高通量测序,结果显示,其对硝化菌具有良好的富集能力,低基质条件下,硝化菌相对丰度可达2.36%,强化了氨氮的去除。经过中置式高密度沉淀池的强化,保障了COD和TP的稳定达标。全厂电耗为0.052 kW·h/t。该工艺路线操作简单,运行成本低,后期维护少,适用于微污染原水的治理。
关键词 微污染原水 预处理 地表水III类标准 移动床生物膜反应器 地表III类水
中图分类号:TU991.2 文献标识码:B 文章编号:1009-0177(2020)07- -
DOI:10.15890/j.cnki.jsjs.2020.07.
Analysis of Design and Operation for a Raw Water Pretreatment Plant in Yancheng City
JING Tianqi, ZHOU Jiazhong ,SHI Dan, LI Fengda, ZHOU Chenyu, WANG Zhongxiang, WU Di
( Qingdao Spring Water Treatment Co., Ltd., Qingdao 266510, China; )
Abstract The total treatment capacity of a raw water pretreatment plant in Yancheng City, Jiangsu Province is 3.0e i5 m3/d, and the effluent is required to meet class III quality standard for Environmental Quality Standards for Surface Water (GB 3838—2002). After full technical and economic demonstration and scheme comparison, with the consideration of quality inflow and outflow, investment land occupation, combined process of "KMnO4 preoxidation + MBBR biochemical tank + medium high density sedimentation tank " are adopted to strengthen the treatment of raw water. The core biochemical section adopts pure MBBR process, with 6 stages of nitrification and an air-water ratio of 0.6~1.3. Actual operation results show that water quality of outflow is stable up to class III standard of surface water, and the minimum ammonia nitrogen is 0.1 mg/L. Results of high-throughput sequencing show that suspended carriers has good enrichment capacity for nitrifying bacteria. Under the condition of low substrate, relative abundance of nitrifying bacteria could reach 2.36%, which enhances the removal of ammonia. Through the strengthening of medium high density sedimentation tank, the stability of COD and TP are guaranteed to reach the standard. The power consumption of the whole plant is 0.052 kW·h/t. Above all, the process is simple in operation, low in operation cost and less in later maintenance, and is suitable for the treatment of micropolluted raw water.
Keywords micropolluted raw water pretreatment class III category of surface water criteria moving bed biofilm reactor (MBBR) class III of surface water
随着工农业迅速发展和居民生活水平的提高,废水排放中污染物质的种类和浓度不断增加,使得饮用水水源环境遭到不同程度的破坏,影响了人们的生命健康。目前,我国城市净水厂大多数采用地表水作为饮用水水源,主要应用“混凝沉淀过滤+消毒”进行处理,但此处理工艺去除有机物质和氨氮比例较低。然而,此类物质在水源地的富集,势必会影响人类的饮用水安全,因此,急需对原水水源进行预处理,以保证人们正常的生活需要。
江苏省政府高度重视水环境整治和水源地建设工作,2015年盐城市出台《全市城乡饮用水安全保障工作方案》,要求利用现有弃土区和农田,建设该区域饮用水安全工程,即原水前期处理工程。通过对净水厂水源水质进行提升,使原水水质能够稳定达到《地表水环境质量标准》(GB 3838—2002)Ⅲ类水标准。
本文以盐城市某水源预处理项目为例,介绍微污染原水治理的设计路线与运行效果,为水源预处理以及微污染原水的治理提供工艺组合方式和技术参考。